Projector cleaning is not a project that can be done without expertise please take it to a service center, you can damage your projector and worse damage your eyes with the high UV output from these units.

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Hi, Heat up is mainly due the clogged heat sink and fan etc, which requires
to be cleaned. It is strongly recommended that you clean the heat sink
etc yourself or seek help from authorized professional at the earliest to
avoid any damages to the PC.If
the system fan is not working properly, it may be due to dust inside
the fan. This
could be due to faulty fan or it may be stuck due to dust etc. In this
case, using a compress air for cleaning would be helpful. This will result in heating up of the system and the
processor/ graphic unit may burn. Try to clean the fan. You may use Compressed Air can to remove the dust etc. Cleaning and lubricating liquid available commercially can be used to smooth the inside rotating parts of the fa. Also, do check the fan power connection. Give it a try and try to make sure the fan is running. (if not it needs replacement).
If you find it faulty, you may find and replace the fan by removing the
old/ faulty fan by removing the 4 screws and installing the new one.

Also, make sure that the PC is placed in a well ventilated environment and the air flow the the PC is correct.The
procedure is very simple and I believe immediate
action is required to prevent any damage to your machine and data.

The projector lifetime has a lot to do with maintenance and environment. Over time, the LCD panels will start to deteriorate. I worked for a rental company where these units were in constant use. After 5 years, they were still going strong. Realize though, that these were highly maintained: constant cleaning via compressed nitrogen to remove dust, lens cleaning and filter changing on a regular basis. Checking for proper fan function and complete disassembly and checking for connections etc.

A word of caution: DO NOT work with the LCD block unless you have access to a clean area and have training. The tolerances here are very small. Slight changes can severely alter the picture quality and all adjustments should be left to a professional.

No one seems to know what they are talking about when it comes to this issue. I had the same problem for a couple of months. I looked up and down the internet for answers and manuals and came out empty handed. I didnt want to pay a repair guy so i decided to take on this filter problem myself. The OSD should say Projector Fan Filter Unit Needs Cleaning. The fan filter unit they are talking about is on the projector itself. That means you have to remove the back panel. I placed the tv on a blanket screen side down. Revome the board inside the stainless case and remove the projector unit. You have to unplug a few cables...thin gauge wires so be careful. Underneith and on the side of the projector are two foam filters. I vacuumed the heck out of them and its been working fine. You could try getting away with removing the front panel to the right of the lamp. you will see the small foam filter to the left of the projector but there is another one under the projector. Try vacuuming the best you can. My tv was pretty dusty inside so I'm glad to dug in a little deeper.

this could be tricky if you are not technically inclined remove the screw on the bottom of the projector four smaller size and four bigger size and 2 at the bottom near the connectors remove the lamp cover and the lamp itself then remove the focus ring and zoom ring then lift the cover from below near the lens slowly take care not to damage the plastic lock underneath it take sometime but be patient you are almost there hope this be of help cheers

Quite possibly getting past it's used by date.
The other thing to check for is the deaded dust. If the fan is covered in dust, it will not cut cleanly through the air and make noise.

Do not use any cleaning soloutions to get rid if the dust, instead, use an old toothbrush. This will be a little tricky if it's one of the fans underneath, but if you cannot remove the fan to clean it, then have someone hold the projector up, so the hole faces down..and the dust will fall that way as well instead of back into the projector.